Crows and ravens can be tricky to tell apart by sight, but their voices are much more distinctive. Watch this video for some expert tips on the sounds these two common birds make and what those sounds mean.
American Crows and Common Ravens have a repertoire of sounds beyond their signature “caw” and “kraa” calls. The crow often makes a rattle sound along with its territorial caw and also communicates through other click and bell-like notes. Ravens broadcast their presence through deep, throaty kraa calls. Narrator Kevin J. McGowan, an ornithologist at the Cornell Lab of Ornithology, uses harmless wing tags to study crows around the Cornell Lab. In this video, he compares the calls of American Crows with those made by Common Ravens. To download a crow identification packet with sound files, click here [https://info.allaboutbirds.org/crow_raven_difference].
Radius-Seam Metal Shear 3514-7R.
Ideal for small radius through multiple seams.
Cold and emission-free operation spiral ducting, seams (min. Ø 90 mm)
General specifications:
- cuts without distortion or straightening of formed parts
- burr free cutting
- no finishing of the edges is required
- accurate cutting along a marked line
- single-side trimming is possible.
- working speed up to max. 5 m/min.
- clear view to scribed line or template
- long life tool
- easy, one hand, operation
- simple and safe to use
- noise under limit regulations
- insulated and suppressed motor
- almost no maintenance necessary
- knife and jaws regrind able
- parts are standardized and interchangeable
Ideal for cutting:
- spiral ducting
- painted or coated aluminum
- sheet-metal, steel studs
- stainless steel
- non ferrous materials (aluminum, copper, zinc)
also available:
- pneumatic: type19/3514-7
-12 Volt cordless tool: type AK 3514-7